Perfect, with a minor extension to get the desired result:
mergeddata <- merge(dataframe.1, dataframe.2,by=c("id1","id2"),all.x=T)
mergeddata$boundary.x[mergeddata$boundary.y==0] <- 0
Thank you Vikas
> -----Original Message-----
> From: Vikas Rawal [mailto:[EMAIL PROTECTED]
> Sent: quinta-feira, 4 de Setembro de 2008 1:28
> To: [EMAIL PROTECTED]
> Subject: Re: [R] how to match or merge data.frames in this case...
>
> > I'm trying to match two data frames in order to replace the boundary
> values
> > in a dataframe.1 with values in dataframe.2 ONLY where the pair id1
> id2
> > matches between the two data frames.
>
> merge(dataframe.1,dataframe.2,by=c("id1","id2"))->mergeddata
>
> Vikas
>
>
>
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